CN104039057B - Constant luminous flux LED module control circuit - Google Patents
Constant luminous flux LED module control circuit Download PDFInfo
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- CN104039057B CN104039057B CN201410306898.5A CN201410306898A CN104039057B CN 104039057 B CN104039057 B CN 104039057B CN 201410306898 A CN201410306898 A CN 201410306898A CN 104039057 B CN104039057 B CN 104039057B
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a constant luminous flux LED module control circuit, and belongs to the technical field of LED illumination. The problem that the luminous flux of an entire lamp set cannot be kept constant when an individual LED lamp goes wrong in the prior art is solved. The constant luminous flux LED module control circuit comprises a switching power supply, a main controller module, a fan control circuit, an LED unit and a drive dimming circuit corresponding to the LED unit. The switching power supply supplies electricity to the main controller module, the fan control circuit and the drive dimming circuit respectively. The main controller module comprises a single chip microcomputer and a DC/DC module, an LED current interface of the single chip microcomputer is connected with the LED unit and used for detecting the working current of the LED unit, and a trouble signal input interface is connected with the trouble signal detection end of the fan control circuit. A PWM signal output end is connected with a PWM signal input interface of the drive dimming circuit, and the current output end of the drive dimming circuit is connected with the LED unit corresponding to the drive dimming circuit. The DC/DC module supplies electricity to the fan control circuit. By means of the constant luminous flux LED module control circuit, it is guaranteed that an LED module can be kept in a constant luminous state in the working process.
Description
Technical field
The invention belongs to led lighting technical field, it is related to a kind of perseverance luminous flux led module group controlling circuit.
Background technology
Adopting electricity-saving lamp, sodium vapor lamp or Metal halogen lamp the lamp light sources such as traditional bulkhead lamp, street lamp, harbour Projecting Lamp, due to passing more
System light fixture power consumption is serious, and LED lamp is more and more used.Adopt numeral or be the led brightness adjustment control method of pwm to be more than
The switch operating frequency of 100hz, the pulse duty factor changing led driving current with the method for pulsewidth modulation carrys out the real tune managing led
Photocontrol, is avoided that human eye feels light modulation scintillation, light modulation is bigger than scope.Therefore, pwm control technology controls letter with it
Single, flexibly and the good advantage of dynamic response and become the most widely used control mode in led.But in prior art, make
It may appear that problems with, in the lamp group within when LED lamp, occurs one or several led with when LED lamp group when using
After damage, the total light flux of led module changes, and the brightness of illumination of LED lamp group is affected.For example, Chinese patent literature
Disclose a kind of undistorted led pwm intednsity circuit of Application No. 201410081380.6, drive including led constant current
Device, pwm signal generating circuit, switching tube, comparator and digital control module；Described led constant-flow driver is used for producing driving
Electric current；Described pwm signal generating circuit is used for producing pwm signal, and controls led constant-flow driver to produce driving current；Described
Switching tube is used for controlling the unlatching of driving current, and when pwm signal is high, the driving current of switching tube is opened, when pwm signal is
When low, the driving current of switching tube is closed；Described comparator is used for obtaining driving current signal and it being extracted as signal, in real time
Relatively obtain actual switch pipe opening time difference；Described digital control module is electrically connected with comparator, when opening for obtaining
Between difference, and by time difference add pwm signal in correct switching tube start lose.Although this control circuit can be passed through
Using digital signal processing module correction pwm constant current output loss, led constant current output signal is made to keep complete, thus ensureing LED lamp
Brightness, but this undistorted control is only to be all intact situation guarantee in all LED lamps, when part led
When lamp damages, actually still can be declined using the illuminance of LED lamp under this control mode, that is, total light flux still declines,
Or illuminating effect can be affected, in addition in this technical scheme, also lack the measure for LED lamp heating protection, therefore also can go out
Existing LED lamp crosses cause thermal damage phenomenon.
Content of the invention
There are the problems referred to above for existing technology it is proposed that a kind of perseverance luminous flux led module group controlling circuit in the present invention, be somebody's turn to do
Control circuit is capable of led module and operationally keeps permanent luminous flux, ensures effectively to radiate simultaneously.
The present invention is realized by following technical proposal: a kind of perseverance luminous flux led module group controlling circuit it is characterised in that,
Including Switching Power Supply, main controller module, fan control circuitry, several led units and several a pair with led unit 1
The driving light adjusting circuit answered, described Switching Power Supply is used for for alternating current being converted to direct current respectively to main controller module, fan
Control circuit and several driving light adjusting circuits are powered, and described main controller module includes single-chip microcomputer and and microcontroller power supply
The dc/dc module that interface connects, the led current interface of described single-chip microcomputer is connected with each led unit respectively and is used for detecting respectively
Electric current during led cell operation, the fault-signal input interface of described single-chip microcomputer and the fault-signal of described fan control circuitry
Test side connects, and the pwm signal input interface that the pwm signal output part of described single-chip microcomputer drives light adjusting circuit with each respectively connects
Connect, each described current output terminal driving light adjusting circuit is all connected with corresponding led unit, and described dc/dc module is used for
The voltage that single-chip microcomputer is exported exports 5v voltage after conversion and powers to fan control circuitry.
This permanent luminous flux led module group controlling circuit detects the electric current of several led units, Ran Hougen respectively by single-chip microcomputer
To judge whether that led unit damages according to electric current, when there being led unit to damage, single-chip microcomputer passes through to change the pwm signal control exporting
Light adjusting circuit is driven to improve the driving current to other intact led units for the output, thus ensureing luminous flux, it is to avoid because of indivedual led
In unit, LED lamp damages and leads to total light flux to decline, and realizes permanent luminous flux and controls；Control fan additionally by fan control circuitry
Motor rotates the heat sinking function realizing led module, and protection led module will not be because crossing cause thermal damage.
In a kind of above-mentioned perseverance luminous flux led module group controlling circuit, described single-chip microcomputer is the flash based on 8051 kernels
mcu.
In a kind of above-mentioned perseverance luminous flux led module group controlling circuit, described Switching Power Supply is ac/dc module, its permission
The alternating voltage of input is interval to be 100-240v, and the DC voltage of output is 24v.
In a kind of above-mentioned perseverance luminous flux led module group controlling circuit, each described driving light adjusting circuit all includes pwm and adjusts
Light device and controller, the pwm signal that described pwm light modulator receives single-chip microcomputer is simultaneously conveyed to controller, and described controller is according to connecing
The pwm signal output current received powers to corresponding led unit.Because single-chip microcomputer can detect the electric current of led unit, therefore, single
Piece machine can change the pwm signal of output according to the led cell current value of detection, therefore drives light adjusting circuit according to reception
The different electric current of pwm signal output drives led unit to realize brightness regulation.
In a kind of above-mentioned perseverance luminous flux led module group controlling circuit, described controller is constant-current decompression voltage-stablizer
lm3406.Lm3406 has the characteristics that wide input voltage range, low reference voltage, low-voltage turn off and output over-voltage protection,
And it is provided with two-conductor line dimming function, built-in comparator and disposably start timer, output current is accurately and transient response
Hurry up.
In a kind of above-mentioned perseverance luminous flux led module group controlling circuit, described fan control circuitry includes controlling ic and wind
Fan motor, the power input termination dc/dc module of described control ic, the pwm signal output part wind-receiving fan motor of described control ic,
The fault detect of described control ic terminates the fault-signal input of single-chip microcomputer.After controlling ic fan failure is detected, by event
Barrier test side sends a signal to single-chip microcomputer, and single-chip microcomputer turns off led current interface according to fan failure signal, thus closing LED lamp,
Protection LED lamp will not damage because overheated.
In a kind of above-mentioned perseverance luminous flux led module group controlling circuit, described control ic is mc642.Mv642 adjusts for pulsewidth
Type (pwm) direct current generator rotation speed of the fan processed controls ic, has the shutdown mode of energy-conservation, its running noises is low, its supply voltage with
Fan supply voltage is separate, and has failure detector circuit, can detect fan failure.
In a kind of above-mentioned perseverance luminous flux led module group controlling circuit, described led unit is to be connected by some LED lamps
The lamp group of composition.So that the brightness of led unit increases, improve illuminance by by some LED lamp series connection.
Compared with prior art, the invention has the advantages that
1st, high brightness, and design for permanent luminous flux, after having the LED lamp in a led unit not work, main controller module
This led unit open can be judged by detecting the current signal of corresponding led unit, by master controller single-chip microcomputer internal processes
Control output pwm signal to pwm light modulator, controller is transmitted signal to by pwm light modulator and improves in addition several led units
Driving current, it is to avoid lead to total light flux to decline because led damages, realize the function of permanent luminous flux.
2nd, can be arranged in the lamp outer casings such as traditional bulkhead lamp, street lamp as single light source (as conventional bulb) it is achieved that
Recycling to conventional lamp shell, not only energy-conservation but also decrease cost of investment.
3rd, pass through the design of fan control circuitry so that led module can be radiated in time, thus protecting LED lamp not
Can damage because overheated.
4th, fault detect interface is set in fan control circuitry, fan failure can be found in time, and pass through main control
Device module closes led module in time, thus avoiding the occurrence of leading to LED lamp to cross cause thermal damage because of fan failure.
Brief description
Fig. 1 is the circuit block diagram of the embodiment of the present invention；
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention.
Specific embodiment
The following is the specific embodiment of the present invention, and combine accompanying drawing and technical scheme is further described,
But the present invention is not limited to these embodiments.
As shown in figure 1, this permanent luminous flux led module group controlling circuit, including Switching Power Supply, main controller module, fan control
Circuit processed, six led units are to drive light adjusting circuit (attached in the present embodiment correspondingly with led unit respectively with six
Fig. 1, only draw a led unit and corresponding driving light adjusting circuit in 2, in actual use, can be as needed
Multiple led units are set, and each led unit are all independently furnished with one and drive light adjusting circuit to power for led unit), switch
Capable AC input one end connect electrical network, direct current output one end connect respectively six drive light adjusting circuits, main controller module and
Fan control circuitry, be mainly used in by alternating current be converted to direct current respectively give main controller module, fan control circuitry and
Six drive light adjusting circuit to power, and main controller module connects fan control circuitry, six drive control circuit and six respectively
Individual led unit, by detecting the electric current on each led unit, main controller module judges whether this led unit damages, and individual
The driving corresponding to other intact led units is controlled to dim by changing the pwm signal exporting when damaging occurs in other led unit
Circuit, the light adjusting circuit that drives corresponding to other intact led units improves output current to correspondence according to the pwm signal receiving
Led unit, the increase rate of each led cell current is obtained by below equation: (LED lamp in each led unit of 0.7*
Number)/remaining normal work led unit number；Main controller module is dimmed by changing the pwm signal exporting, from
And ensure that total light flux is in steady state, realize permanent luminous flux and control.Lead to remain of course for avoiding multiple led units to damage
The occurrence of in remaining led unit, electric current is excessive, is defined also by the following manner: when led unit LED lamp damage
When number is more than three groups (exceeding the half of total led unit number), in main controller module, setting program acquiescence led unit is equal
It is in open circuit, automatically close all led units that go out.In the present embodiment, led unit is the lamp group being composed in series by some LED lamps.
So that the brightness of led unit increases, improve illuminance by by some LED lamp series connection.
Fig. 2 is the detailed circuit schematic diagram of this permanent luminous flux led module group controlling circuit, and particular content is as follows:
Main controller module includes single-chip microcomputer u1 and the dc/dc module being connected with single-chip microcomputer u1 power interface vdd.Wherein,
Single-chip microcomputer u1 is the flash mcu based on 8051 kernels, and the pin p4.1 of single-chip microcomputer u1, pin p4.0 are respectively as led electric current
The positive pole input of interface and negative pole input for detecting electric current during each led cell operation, and pin p2.7 is as output pwm signal
Output interface, pin p2.6 is as the fault-signal input of fan control circuitry.Dc/dc module allows the direct current of input
Press as 19-28v, the DC voltage of its output is 5v, for the voltage that export single-chip microcomputer u1 after conversion output 5v voltage
Power to fan control circuitry.
Light adjusting circuit is driven to include pwm light modulator, constant-current decompression voltage-stablizer u2, shunt capacitance cin, resistance ron, coupling electricity
Hold cb, diode d1, energy storage inductor l1, compensating electric capacity cc and electric capacity cf, wherein crossing current voltage-releasing voltage stabilizer u2 is lm3406, its
Pin vin connects shunt capacitance cin positive pole and Switching Power Supply, as power input, pin ron as time control interface, with
Resistance ron one end connects, and the other end of resistance ron is connected with Switching Power Supply, and pin dim is connected with the output end of pwm light modulator,
The power input of pwm light modulator is connected with Switching Power Supply, the pwm signal input part of pwm light modulator and the pin of single-chip microcomputer u1
P2.7 connects.The pin comp of constant-current decompression voltage-stablizer u2 is connected with compensating electric capacity cc positive pole, compensating electric capacity cc minus earth.Permanent
The pin vcc of stream voltage-releasing voltage stabilizer u2 is grounded by electric capacity cf, pin cs bearing as led current feedback pin and led unit
Pole connects, and pin vout is connected with the positive pole of led unit as voltage output end, and pin sw, as switch pin, connects two respectively
The negative pole of pole pipe d1, energy storage inductor l1 one end connect, and the energy storage inductor l1 other end connects led unit positive pole.Diode d1 is just
Pole is grounded, and negative pole is also connected with coupled capacitor cb negative pole, and coupled capacitor cb positive pole meets the pin boot of constant-current decompression voltage-stablizer u2.
Each drives light adjusting circuit all to include pwm light modulator and controller, and pwm light modulator receives the pwm signal of single-chip microcomputer u1 and conveys
To constant-current decompression voltage-stablizer u2, constant-current decompression voltage-stablizer u2 supplies to corresponding led unit according to the pwm signal output current receiving
Electricity.Because single-chip microcomputer u1 can detect the electric current of led unit, therefore, single-chip microcomputer u1 can according to detection led cell current value Lai
Change the pwm signal of output, therefore drive light adjusting circuit to drive led unit according to the different electric current of the pwm signal output receiving
Realize brightness regulation.
Switching Power Supply is ac/dc module, and it allows the alternating voltage of input interval is 100-240v, the DC voltage of output
For 24v.
Fan control circuitry includes controlling ic, pressure limiting resistance r1, shunt capacitance c1, current-limiting resistance r2, electric capacity c2, electric capacity
C3, weakening electric capacity c4, electric capacity c5, resistance r3, resistance r4, fault detect resistance r6, Motor drive npn transistor and fan electricity
Machine, control ic is mc642, and in figure is represented with u3, and mv642 is that PWM-type (pwm) direct current generator rotation speed of the fan controls ic, tool
There is the shutdown mode of energy-conservation, its running noises is low, its supply voltage is separate with fan supply voltage, and there is fault inspection
Slowdown monitoring circuit can detect fan failure, controls the pin vin of ic to connect shunt capacitance c1 and connect dc/dc mould by pressure limiting resistance r1
Block output end, pin cf connects the shunt capacitance other end and being grounded by electric capacity c2, pin vmin connect resistance r3 negative pole with
And electric capacity c3 positive pole, resistance r3 positive pole connects dc/dc module output end；Electric capacity c3 minus earth, current-limiting resistance r2 positive pole connects pressure limiting
Resistance r1 negative pole, current-limiting resistance r2 minus earth；Control the pin gnd ground connection of ic, pin sense connects single-chip microcomputer u1's respectively
P2.6 pin and the positive pole of electric capacity c5, electric capacity c5 negative pole connects fault detect positive pole, fault detect resistance r6 minus earth；Control ic
Pin vout as pwm signal output interface, connect the base stage of Motor drive npn transistor, Motor drive npn transistor
The positive pole of emitter stage connecting fault detection resistance r6, the colelctor electrode of Motor drive npn transistor connects fan electromotor, fan electromotor
It is also connected with Switching Power Supply；The pin vdd controlling ic connects electric capacity c4 positive pole, electric capacity c4 minus earth.Ic is controlled fan event is detected
After barrier, single-chip microcomputer u1 is sent a signal to by fault detect end, single-chip microcomputer turns off led current interface according to fan failure signal,
Thus closing LED lamp, protection LED lamp will not damage because overheated.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (8)
1. a kind of perseverance luminous flux led module group controlling circuit it is characterised in that, including Switching Power Supply, main controller module, fan control
Circuit processed, several led units and several drive light adjusting circuit correspondingly with led unit, described Switching Power Supply is used
Supply to main controller module, fan control circuitry and several driving light adjusting circuits respectively in alternating current is converted to direct current
Electricity, described main controller module includes single-chip microcomputer and the dc/dc module being connected with microcontroller power supply interface, described single-chip microcomputer
Led current interface is connected and is used for detecting electric current during each led cell operation with each led unit respectively, described single-chip microcomputer
Fault-signal input port is connected with the fault-signal test side of described fan control circuitry, and the pwm signal of described single-chip microcomputer is defeated
Go out end to be connected with the pwm signal input interface of each driving light adjusting circuit respectively, the electric current of each described driving light adjusting circuit is defeated
Go out end and be all connected with corresponding led unit, the voltage that described dc/dc module is used for exporting single-chip microcomputer exports after conversion
5v voltage is powered to fan control circuitry, and single-chip microcomputer judges whether that according to electric current led unit damages, and damages when there being led unit
When, single-chip microcomputer passes through to change the driving to other intact led units for the pwm signal control driving light adjusting circuit raising output exporting
Electric current, described fan control circuitry is used for controlling fan work and when led unit needs radiating to improve the rotating speed of fan when increasing.
2. a kind of perseverance luminous flux led module group controlling circuit according to claim 1 is it is characterised in that described single-chip microcomputer is
Flash mcu based on 8051 kernels.
3. a kind of perseverance luminous flux led module group controlling circuit according to claim 2 is it is characterised in that described Switching Power Supply
For ac/dc module, it allows the alternating voltage of input interval is 100-240v, and the DC voltage of output is 24v.
4. a kind of perseverance luminous flux led module group controlling circuit according to claim 2 is it is characterised in that each described driving
Light adjusting circuit all includes pwm light modulator and controller, and described pwm light modulator receives the pwm signal of single-chip microcomputer and is conveyed to control
Device, described controller powers to corresponding led unit according to the pwm signal output current receiving.
5. a kind of perseverance luminous flux led module group controlling circuit according to claim 4 is it is characterised in that described controller is
Constant-current decompression voltage-stablizer lm3406.
6. a kind of perseverance luminous flux led module group controlling circuit according to claim 2 is it is characterised in that described fan control
Circuit also includes controlling ic and fan electromotor, the power input termination dc/dc module of described control ic, the pwm of described control ic
Signal output part wind-receiving fan motor, the fault detect of described control ic terminates the fault-signal input of single-chip microcomputer.
7. a kind of perseverance luminous flux led module group controlling circuit according to claim 6 is it is characterised in that described control ic is
mc642.
8. a kind of perseverance luminous flux led module group controlling circuit according to claim 1-7 any one is it is characterised in that institute
Stating led unit is the lamp group being composed in series by some LED lamps.
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| CN201410306898.5A CN104039057B (en) | 2014-06-30 | 2014-06-30 | Constant luminous flux LED module control circuit |
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| CN201410306898.5A CN104039057B (en) | 2014-06-30 | 2014-06-30 | Constant luminous flux LED module control circuit |
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| JP6516178B2 (en) * | 2014-10-20 | 2019-05-22 | パナソニックＩｐマネジメント株式会社 | Dimming control unit, lighting system, and equipment |
| WO2017025324A1 (en) * | 2015-08-07 | 2017-02-16 | Philips Lighting Holding B.V. | Lighting control |
| CN106714411B (en) * | 2015-11-13 | 2019-12-10 | 比亚迪股份有限公司 | switch dimming circuit |
| CN107884943A (en) * | 2017-12-11 | 2018-04-06 | 江苏飞视文化发展有限公司 | A kind of viewbox |
| CN109302773A (en) * | 2018-11-15 | 2019-02-01 | 常州格林照明股份有限公司 | A kind of LED projector lamp driving circuit |
| CN110223617B (en) * | 2019-06-04 | 2023-06-27 | 惠州市力天科技有限公司 | Control circuit and driving method of external equipment of touch integrated machine |
| CN110708849A (en) * | 2019-09-30 | 2020-01-17 | 苏州精濑光电有限公司 | Illumination control system and lamp box |
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